XINS is a technology used to define, create, and
invoke remote APIs. XINS is
specification-oriented. When API specifications
are written (in XML), XINS will transform them to
HTML-based documentation and Java code for both
the client-side and the server-side. The
communication is based on HTTP. XINS competes with
the complex SOAP technology. Main design goals
include simplicity, scalability, and testability.
XINS is not only a specification technology, but
also an application development framework. It
offers transaction logging, unique log
documentation, and active code generation.

Gearmand is the job server component of Gearman.
Gearman provides a generic framework to farm out
work to other machines, dispatching function calls
to machines that are better suited to do work, to
do work in parallel, to balance the load of
processing, or to call functions between
languages.

dbus-cxx is a C++ wrapper for dbus that supports introspection and includes a proxy/adapter generator (dbus-cxx-xml2cpp). What differentiates dbus-cxx from other C++ wrappers is that dbus-cxx relies heavily on sigc++ and explicitly exposes the wrapped D-Bus C API.

PyAMF provides Action Message Format (AMF) support for Python that is compatible with the Adobe Flash Player. It includes integration with Python Web frameworks like Django, Pylons, Twisted, SQLAlchemy, and more. The Adobe Integrated Runtime and Adobe Flash Player use AMF to communicate between an application and a remote server. AMF encodes remote procedure calls (RPC) into a compact binary representation that can be transferred over HTTP/HTTPS or the RTMP/RTMPS protocol. Objects and data values are serialized into this binary format, which increases performance, allowing applications to load data up to 10 times faster than with text-based formats such as XML or SOAP.

python-symmetric-jsonrpc is a JSON-RPC implementation for Python that is symmetric (both ends can call each other), asynchronous (calls can interleave with responses), thread-safe, and transport agnostic (can be run on top of e.g. an SSL connection).

nessus-xmlrpc is a Ruby library for the Nessus XML-RPC interface. You can use it to start, stop, pause, and resume scans. It lets you watch progress and status of scans, download reports, etc. It comes with an example command line program that shows how easy it is to interact with the Nessus scanner.

Ext Direct App is a PHP class that can be used to call PHP classes from JavaScript. It generates JavaScript code to use the ExtJS library and send AJAX requests to a PHP script using this class to handle the requests. The class should be extended to implement the actions to handle the different types of AJAX requests that the applications may need.

Net::Nessus::XMLRPC is Perl interface for communication with the Nessus scanner over XMLRPC. It lets you start, stop, pause, and resume scans. It can display the progress and status of scans, download reports, etc.